Increased attention directed towards evidence-based aid clearly dominates evaluation discussions within the development community. All development agencies, but particularly non-governmental organizations (NGO), struggle with the requirements for rigorous impact assessments of their project/program interventions. Given the serious operational obstacles confronting impact assessments, any successful integration of impact assessments into ongoing and new NGO programs can gain from the adoption of a shared learning model centered on organizational leadership, people, technology and knowledge. Integrated impact assessment, as shared learning, requires a cultural change within the NGO initiated and maintained by the organization’s leadership.